﻿using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using WeixinSB.Common;
using WeixinSB.Model;
using WeixinSB.Tools;
using Windows.ApplicationModel.Activation;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.Storage;
using Windows.Storage.Pickers;
using Windows.Storage.Streams;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Media.Imaging;
using Windows.UI.Xaml.Navigation;

// “空白页”项模板在 http://go.microsoft.com/fwlink/?LinkID=390556 上有介绍

namespace WeixinSB.View
{
    /// <summary>
    /// 可用于自身或导航至 Frame 内部的空白页。
    /// </summary>
    public sealed partial class HongBaoEditPage : Page, IFileOpenPickerContinuable
    {
        private readonly NavigationHelper navigationHelper;
        private readonly ObservableDictionary defaultViewModel = new ObservableDictionary();

        private readonly string receiveFileName = Guid.NewGuid() + ".jpg";

        private readonly string sendFileName = Guid.NewGuid() + ".jpg";

        private const string Prefix = "ms-appdata:///local/";

        const string RECEIVE_HEAD_TYPE_KEY = "ReceiveHeadType";

        const string SEND_HEAD_TYPE_KEY = "SendHeadType";

        private HongBaoReceiveModel itemReceive = new HongBaoReceiveModel();

        private HongBaoSendModel itemSend = new HongBaoSendModel();

        public HongBaoEditPage()
        {
            this.InitializeComponent();

            this.navigationHelper = new NavigationHelper(this);
            this.navigationHelper.LoadState += this.NavigationHelper_LoadState;
            this.navigationHelper.SaveState += this.NavigationHelper_SaveState;
        }

        /// <summary>
        /// Gets the <see cref="NavigationHelper"/> associated with this <see cref="Page"/>.
        /// </summary>
        public NavigationHelper NavigationHelper
        {
            get { return this.navigationHelper; }
        }

        /// <summary>
        /// Gets the view model for this <see cref="Page"/>.
        /// This can be changed to a strongly typed view model.
        /// </summary>
        public ObservableDictionary DefaultViewModel
        {
            get { return this.defaultViewModel; }
        }

        /// <summary>
        /// Populates the page with content passed during navigation. Any saved state is also
        /// provided when recreating a page from a prior session.
        /// </summary>
        /// <param name="sender">
        /// The source of the event; typically <see cref="NavigationHelper"/>.
        /// </param>
        /// <param name="e">Event data that provides both the navigation parameter passed to
        /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested and
        /// a dictionary of state preserved by this page during an earlier
        /// session.  The state will be null the first time a page is visited.</param>
        private async void NavigationHelper_LoadState(object sender, LoadStateEventArgs e)
        {
            // TODO: Create an appropriate data model for your problem domain to replace the sample data.
            //var item = await SampleDataSource.GetItemAsync((string)e.NavigationParameter);
            //this.DefaultViewModel["Item"] = item;
        }

        /// <summary>
        /// Preserves state associated with this page in case the application is suspended or the
        /// page is discarded from the navigation cache.  Values must conform to the serialization
        /// requirements of <see cref="SuspensionManager.SessionState"/>.
        /// </summary>
        /// <param name="sender">The source of the event; typically <see cref="NavigationHelper"/>.</param>
        /// <param name="e">Event data that provides an empty dictionary to be populated with
        /// serializable state.</param>
        private void NavigationHelper_SaveState(object sender, SaveStateEventArgs e)
        {
            // TODO: Save the unique state of the page here.

        }

        /// <summary>
        /// 在此页将要在 Frame 中显示时进行调用。
        /// </summary>
        /// <param name="e">描述如何访问此页的事件数据。
        /// 此参数通常用于配置页。</param>
        protected async override void OnNavigatedTo(NavigationEventArgs e)
        {
            await Windows.UI.ViewManagement.StatusBar.GetForCurrentView().HideAsync();

            itemReceive = HongBaoReceiveModel.Get();
            itemSend = HongBaoSendModel.Get();

            receive.DataContext = itemReceive;
            send.DataContext = itemSend;
        }

        private static void OpenFile(string type, string dataKey)
        {
            FileOpenPicker openPicker = new FileOpenPicker();

            openPicker.ViewMode = PickerViewMode.Thumbnail;
            openPicker.ContinuationData[dataKey] = type;
            openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
            openPicker.FileTypeFilter.Add(".jpg");
            openPicker.FileTypeFilter.Add(".jpeg");
            openPicker.FileTypeFilter.Add(".png");

            // Launch file open picker and caller app is suspended and may be terminated if required
            openPicker.PickSingleFileAndContinue();
        }

        public async void ContinueFileOpenPicker(FileOpenPickerContinuationEventArgs args)
        {
            if (args.Files.Count > 0)
            {
                //OutputTextBlock.Text = "Picked photo: " + args.Files[0].Name;
                StorageFile file = args.Files[0];

                IRandomAccessStream fileStream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read);
                BitmapImage bitmapImage = new BitmapImage();
                bitmapImage.SetSource(fileStream);
                if (args.ContinuationData.ContainsKey(RECEIVE_HEAD_TYPE_KEY) && args.ContinuationData[RECEIVE_HEAD_TYPE_KEY].ToString() == ImageType.ReceiveHead.ToString())
                {
                    //头像1
                    //var brush = new ImageBrush();
                    //brush.ImageSource=bitmapImage;
                    receiveHead.Source = bitmapImage;

                    var bytes = await BufferExtension.IRandomAccessStreamToBytes(fileStream);
                    await StorageFileEx.Create(receiveFileName, bytes);

                    itemReceive.HeadImg = Prefix + receiveFileName;

                }
                else if (args.ContinuationData.ContainsKey(SEND_HEAD_TYPE_KEY) && args.ContinuationData[SEND_HEAD_TYPE_KEY].ToString() == ImageType.SendHead.ToString())
                {
                    //头像2
                    //var brush = new ImageBrush();
                    //brush.ImageSource = bitmapImage;
                    sendHead.Source = bitmapImage;

                    var bytes = await BufferExtension.IRandomAccessStreamToBytes(fileStream);

                    await StorageFileEx.Create(sendFileName, bytes);

                    itemSend.HeadImg = Prefix + sendFileName;

                }
            }
            else
            {
                //OutputTextBlock.Text = "Operation cancelled.";
            }
        }


        private void Selected_Changed(object sender, object e)
        {
            var lb = sender as ListView;
            if (lb != null)
            {
                lb.SelectedIndex = -1;
            }
        }

        private void Send_Tapped(object sender, TappedRoutedEventArgs e)
        {
            OpenFile(ImageType.SendHead.ToString(), SEND_HEAD_TYPE_KEY);
        }

        private void Receive_Tapped(object sender, TappedRoutedEventArgs e)
        {
            OpenFile(ImageType.ReceiveHead.ToString(), RECEIVE_HEAD_TYPE_KEY);
        }
    }
}
